Exhalation of isotopic CO2.
D000818:Animals; D001944:Breath Tests / Q000295:instrumentation / Q000379:methods*; D002245:Carbon Dioxide / Q000378:metabolism*; D002250:Carbon Radioisotopes; D002478:Cells, Cultured; D006801:Humans; D007700:Kinetics; D013058:Mass Spectrometry; D008722:Methods; D004364:Pharmaceutical Preparations / Q000378:metabolism*; D012119:Respiration; D013048:Specimen Handling / Q000379:methods
D002250:Carbon Radioisotopes; D004364:Pharmaceutical Preparations; D002245:Carbon Dioxide